public class Test2 {
    public static void main(String[] args) {
        Object locker1 = new Object();
        Object locker2 = new Object();
        Thread t1 = new Thread(()->{
            synchronized (locker1){
                synchronized (locker2){

                }
            }
        });
        Thread t2 =new Thread(()->{
            synchronized (locker2){
                synchronized (locker1){

                }
            }
        });
        t1.start();
        t2.start();
    }
}
